<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
    <title>无标题文档</title>
    <style>
        .shadow{
            float:left;
            margin-left:20px;
            background: #EEFF99;
            width:200px;
            height:400px;
        }
        .shadow:hover{
            box-shadow:0 0 10px 10px #06c;
    </style>
</head>

<body>
<div class="shadow"></div>
<div class="shadow"></div>
<div class="shadow"></div>
</body>
</html>
